The Niacinamide 15 Serum

$ 25.00
  • Details
  • How to Use
  • Ingredients
  • About This Brand

What is it:  Highly concentrated serum that combines the maximum concentration of Niacinamide with optimal ratios of synergistic ingredients for total acne control.  


With a high concentration of 15% Niacinamide, this serum provides intensive acne care by controlling excess sebum, soothing inflammation, and tightening the pores. An optimal ratio of N-Acetylglucosamine(NAG), Zinc PCA, and Allantoin works in synergy with Niacinamide to target breakouts and blemishes at all stages to fade hyperpigmentation, balance the skin, and promote recovery of damaged skin. Its light, watery texture absorbs quickly, leaving the skin feeling refreshed.


Clinical Results in 4 Weeks : 

Suitable for acne prone skin use (Non-comedogenic)

- 45.27% improvement of activated sebaceous glands
- 48.07% improvement of oil synthesis amount
- 42.72% improvement of number of blackheads
- 50% improvement of number of whiteheads
- 15.50% improvement of (hidden melasma and blemishes)
- 19.47% improvement of pigmentation (visible melasma and blemishes)
- 2.59% improvement of triple-complexion skin tone (brightness)
- 24.89% improvement of triple-complexion skin tone (redness)
- 11.73% improvement of triple-complexion skin tone (yellowness)

*Based on clinical trials of 20 subjects.
*Dermacosmetic Skin Science Laboratory Co., Ltd.


20ml / 0.67 fl. oz

After cleansing, during the serum phase, apply 2-3 drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges. * This serum can be used in the morning and/or afternoon. For daytime use, follow with an SPF of 30 or higher sunscreen.


Water, Pentylene Glycol, Niacinamide(15%), Butylene Glycol, Acetyl Glucosamine, 1,2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol

One of the most beloved K-beauty brands. Cosrx is known for its precise formulations and consistent performance thanks to a series of high-performing ingredients that drive results.

Customer Reviews

Based on 92 reviews
Anna W.
Very high quality packaging and

Very high quality packaging and ingredients. Application is simple, just a dropper. The serum is slightly thicker than the hyaluronic serum, but disappears into the skin and works wonders.

Beverly W.
I love the COSRX skin

I love the COSRX skin care product line! My skin is on the drier side but still very sensitive. It's been very difficult to find products that keep my face moisturized without breaking out. So many things, even very expensive and quality products, have petrolatum and shea butter in them. Both of them cause breakouts for me. The Niaacinamide 15 is keeping my skin looking radiant. I have bought sever other products and my skin is moisturized and white heads are vanishing.

Sandra M.
Everyday skin need

I love niacinamide serums, I have mature skin, normal to oily (depends on the season) and this serum is excellent. My skin can get red and inflamed easily by the simplest products but my skin loved this. I use it daily and will continue to purchase. I recently had a reaction to the ordinarys products and I learned about Cosrx last month.

Madeleine B.
I am astonished at how

I am astonished at how well it works on keeping sebum levels down throughout the course of a busy day on my very sensitive skin.


I'm excited with this product! I have oil skin and niacinamide really help me to control sebum.